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Help,I think I'm being scammed. I have some item for sale on classified websites.I have had a few interested people.When write to me they refer to I have to get the money from my client,Then you cash the check and wait till check clears and it will be more than the cost of Item so you can pay for shipping then send the rest to me Western union.One even said all of the above then western union money to NHO Nana Heart association and they promised me they would make the donation.Like I care I didn't ask them to make a donation so why would they insure me they would make sure they would make it once I send the remaining money western union from the check I cash.This guy even give me his name address phone # what should I do.He said he was mailing check through us postal service any have any suggestions,should I call the police or am I just over panicking?PLEASE HELP